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A178081 as a simple table

na(n)
00
11
21
3-1
42
53
61
7-11
8-16
935
10-129
11-299
12-386
133977
148063
15-42489
16269344
171000009
183727745
19-47166649
20-123526014
211764203419
22-18228952703
23-113727892147
24-1065812586544
2518344075481339
2652130069331199
27-2470319425874195

[0,1,1,-1,2,3,1,-11,-16,35,-129,-299,-386,3977,
 8063,-42489,269344,1000009,3727745,-47166649,
 -123526014,1764203419,-18228952703,-113727892147,
 -1065812586544,18344075481339,52130069331199,
 -2470319425874195]